EM73P362 datasheet(6/44 Pages) EMC

6 / 44 page

This specification are subject to be changed without notice.

11.1.2001

EM73P362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

STACK:

There are 13-level (maximum) stack for user using for subroutine (including interrupt and CALL). User can

assign any level be the starting stack by giving the level number to stack pointer (SP).

ZERO- PAGE:

From 00h to 0Fh is the location of zero-page. It is used as the pointer in zero-page addressing mode for the

instruction of "STD #k,y; ADD #k,y; CLR y,b; CMP k,y".

PROGRAM EXAMPLE: To wirte immediate data "07h" to address "03h" of RAM and to clear bit 2 of RAM.

STD #07h, 03h ; RAM[03]

← 07h

CLR 0Eh,2 ; RAM[0Eh]

2 ← 0

Increment

Address

20h - 2Fh

30h - 33h

Level 0

Level 4

Level 8

Level 12

Level 1

Level 5

Level 9

Level 2

Level 6

Level 10

Level 3

Level 7

Level 11

00h - 0Fh

10h - 1Fh

Stack

Zero-page

DATA RAM ( 52-nibble )

There is total 52 - nibble data RAM from address 00 to 33h

Data RAM includes 3 parts: zero page region, stacks and data area.

PROGRAM EXAMPLE: Read out the ROM code of address 777h by table-look-up instruction.

LDIA #07h;

STADPL

; [DP]

L ← 07h

STADPM

; [DP]

M ← 07h

STADPH

; [DP]

H ← 07h, Load DP=777h

LDL #00h;

LDH #03h;

LDAX

; ACC

← 6h

STAMI

; RAM[30]

← 6h

LDAXI

; ACC

← 5h

STAM

; RAM[31]

← 5h

;

ORG 777h

DATA 56h;

When user using any instruction of CALL or subroutine, before entry the subroutine, the previous PC address

will be saved into stack until return from those subroutines, the PC value will be restored by the data saved

in stack.

DATA AREA:

Except the special area used by user, the whole RAM can be used as data area for storing and loading general

data.

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